As he mourned the US ambassador to Libya along with other three officials who were killed in Libya attack, President Barack Obama vowed on Friday to “stand fast” against attacks targeting the American diplomatic missions.

As he mourned the US ambassador to Libya along with other three officials who were killed in Libya attack, President Barack Obama vowed on Friday to “stand fast” against attacks targeting the American diplomatic missions.

US ambassador Chris Stevens and the three other Americans died Tuesday when a group of furious, over a video that mocks Islam and Prophet Mohammad (pbuh), attacked the US consulate in Benghazi.

"Their sacrifice will never be forgotten, we will bring to justice those who took them from us. We will stand fast against the violence on our diplomatic missions," Obama said at Andrews Air Force Base outside Washington.

"Even as voices of suspicion and mistrust seek to divide countries and cultures from one another, the United States of America will never retreat from the world," Obama ‘vowed.’

Fury sparked by the anti-Islam film which was produced by extremist Jews and Copts in the US spread across some Islamic countries.